Malicious PDF — malware analysis report

Static analysis result for SHA-256 813b315981a0f74e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 03:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0003af1b399daf6f1de6b6d9e9cf84a7 SHA-1: dbdc4ce7572537f46a6d05c738bd41bf0a1ef355 SHA-256: 813b315981a0f74e1e62214dc6b1adeb5545791a0cc4cd0610386e1bcc477403
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://unibel.pl/pliki/upload/file/62329670603.pdf In PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ooa7fhrm6qbamv2vpemmtr8063/38788463908.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/pezosuneloseduzizazu.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/zesotixusazek.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/pifukeguwetazemofemefo.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/viniledejokaxujazapijagut.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/54854458868.pdfIn PDF document text
    • https://photojet.net/userfiles/file/gexototaxikajigejug.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/mowegeseropakeramozobasi.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gonejonirozuko.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0325b5ca1---21521651025.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/mipujamobamenirokowosixam.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/rabawig.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/girotilulajimusorukis.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210714080706.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6f81c44f040983564ea0b8404568a6bf/sevemevupofanoripo.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/63489255263.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/39495123539.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/folisijapumegure.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/l6vus5omii3l9bkn8931lsjkvp/lixonebutasijig.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/telunatemupijoxij.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612853be63e92---terojoguriban.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/i4gm3koe9ou826fvojkj3u21gt/61187999987.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be46e2b093e---33572712127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+maths+worksheets+year+6+fractionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 17712 bytes
SHA-256: ca6beb2fbd191d64c9483e8c0a2ede9acfc37a672a0f5345dcf40fb1c126ad63
font_02_sfnt_off0001249f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249F 10992 bytes
SHA-256: efcc7c6e76f9b741dd2fa2ff04d07d5a2ebaa3c6bf5520126a2b7d9eca2878c2

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